Engine-stop.



G. DE'WEES.

ENGINE STOP.

APPLICATION FILED 00T.12, 1909.

Patented Apr. 5, 1910.

$5M emu MUM- wi/imaooeo UNITE STATES PATENT QFFICE.

CHARLES DEWEES, OF BAKERSFIELD, CALIFORNIA.

ENGINE-STOP.

To all whom it may concern:

Be it known that I, CHARLES DEWEns, a citizen of the United States,residing at Bakersfield, in the county of Kern and State of California,have invented certain new and useful Improvements in Engine-Stops, ofwhich the following .is a specification, reference being had to theaccompanying drawings.

My invention relates to improvements in mechanism for limiting the speedof engines and particularly pumping engines used in oil-well regions;and an object of my invention is to provide a mechanism of the characterdescribed which will be sim ple in construction, comparatively cheap inmanufacture and most efficient and reliable in use.

Another object of my invention is to provide an apparatus of thecharacter described which will require a small expenditure of money forits upkeep or maintenance in repair and of which the first cost ofinstallation will be comparatively low.

In the drawings illustrating the principle of my invention and the bestmode now known to me of applying that principle, Figure 1 is anelevation showing my new engine-stop mechanism in position upon apumping engine, so much of the latter belng shown as is necessary toillust'ate my invention; and Figs. 2, 3 and 4: are sections on the linesAA, 'BB and CC of Fig. 1, respectively.

a is the bed, I) is the cylinder and 0 is the fly-wheel of a pumpingengine to which my new engine-stop mechanism may be applied. The livesteam flows through the steammain cl past the throttle-valve a into thesteam-chest Upon the valve-stem g of the throttle-valve e is mounted awheel it the outer portion of the rim of which is formed withratchet-teeth 2' and the inner portion of the rim of which is formedwith a circumferential groove 7'. In the latter lies a cord is, one endof which is fastened to the wheel h and the other end of which isattached to a weight m. Adapted and designed to engage with theratchet-teeth z is a pawl or dog it pivoted at 0 upon a post p. Thelatter is formed with a longitudinal slot 9 and is fastened to the sideof the steam-chest f by a screw-bolt 1' which passes through the slot 9,thereby permitting the post p to be so positioned that the dog aSpecification of Letters Patent.

Application filed October 12, 1909.

Patented Apr. 5, 1910. Serial No. 522,238.

will operate most efliciently. To one of the spokes s of the fly-wheel cis fastened by bolts 5 a guide-sleeve a formed at its ends with flangeso. Through this guidesleeve u passes the shank or stem 10 of a plunger,the lower end of which is enlarged to form a weight w and the upper endof which is threaded to engage a nut 3 A coil-spring 2 surrounds theupper end of the plunger-stem w and its outer end bears against one ofthe flanges v, while its inner end bears against a washer 2. The tensionof the coil-spring .2 tends to draw the eularged end a' of the plungeragainst the guide-sleeve a. To the engine-bed (z is suitably fastened abracket 3 in which is mounted a pivot-pin 4. The latter lies in a planeoblique to the horizontal and upon it is mounted a bell-crank lever 5,one arm 6 of which is p'wotally fastened to the lower end of thesleeve-rod 7. One end of a rod 8 is bent and passes through a hole inthe heel 9 of the dog it and is fastened by a cotter-pin 10. The otherend of the rod 8 enters the upper end of the sleeve-rod or tubularconnecting-rod 7 and is fastened therein by the set-screw 11.-

As the speed of rotation of the flywheel 0 increases, the enlarged enda: of the plung'er moves outwardly against the tension of thecoil-spring 2, and when the speed of rotation of the fly-wheel c exceedsa predetermined allowable maximum, the enlarged end a: is moved so faroutwardly that it strikes the free end 12 of the bell-crank lever 5,whereby the dog a is tripped and disengaged from the ratchet-teeth '1.The weight m is thereby allowed to fall and the valve-stem g is rotated,cutting off the supply of steam and stopping the engine.

My new engine-stop mechanism will opera te equally well no matter inwhich direction the fly-wheel 0 may happen to be rotating.

I claim:

1. An engine-stop mechanism consisting of a valve-controlling device;gravity-controlled means for actuating the same; a ratchet-wheel mountedon said device for locking the same; a dog which engages saidratchet-wheel; means for positioning said dog; means for tripping thelatter to release said ratchet-wheel and permit said means to actuatesaid device; a fly-wheel;

and mechanism carried thereby for actuating said tripping means, whenthe speed of the fly-wheel exceeds a predetermined maximum.

2. An engine-stop mechanism consisting of a valve-controlling device;gravity-controlled means for actuating the same; mechanism for lockingsaid means against operation; tripping mechanism for releasing saidlocking mechanism; and a two-part connecting device which connects saidmechanisms and one part of which telescopes into the other.

3. An engine-stop mechanism consisting of a valve-controlling device;gravity-controlled means for actuating the same; mechanism for lockingsaid means against operation; a fly-wheel spring-controlled plungermechanism carried thereby; a bell-crank lever one end of which isarranged to be tripped by said plunger mechanism; and a device forconnecting the other end of said bell-crank lever and said lockingmechanism.

4. An engine-stop mechanism consisting of a valve-controlling mechanism;gravitycontrolled means for actuating thev same; pawl and-ratchetmechanism for locking said means against operation; tripping mechanismfor releasing said pawlandratchet mechanism to permit said means tooperate; and a two-part connecting device which connects saidpawl-and-ratchet mechanism and one part of which telescopes into theother.

5. An engine-stop mechanism consisting of a spring-controlled plunger; aguide for the latter; a valve-stem; a ratchet-wheel mounted thereon; aWeight; a cord one end of which is fastened to said weight and the otherend of which is fastened tosaid valvestem ;a dog which engages andthereby locks said ratchetrwheel and valve-stem; a bellcrank lever oneendof which. is adapted to be tripped by said plunger; and a two-partconnecting device which connects the other end ofsaid; bell-crank leverand dog and one part of which telescopes into the other.

In testimony whereof I hereunto set my hand at said. Bakersfield in thepresence 01": the two undersigned witnesses this th day of August, 1909;

CHARLES DE WEES.

Witnesses:

H. S. MINOR; W. W. KAYE.

